J. Biochem, 1986, Vol. 99, No. 5 1465-1472
© 1986 Japanese Biochemical Society
research-article |
The Initial Phosphate Burst in ATP Hydrolysis by Myosin and Subfragment-1 as Studied by a Modified Malachite Green Method for Determination of Inorganic Phosphate
*Department of Biochemistry Okayama, Okayama 700
**Department of Microbiology, Okayama University Dental School Okayama, Okayama 700
***Department of Physiology, Medical College of Oita Oita 87956
1 To whom all inquiries should be addressed
The Malachite Green method for determination of inorganic phosphate (P1 (Itaya K. & Ui, M. (1966) Clin. Chim. Acta 14, 361366) was modified to measure P in the range of 0.215 nmol per ml of ATPase reaction mixture. An ATPase reaction mixture is quenched with an equal volume of 0.6 M PCA; the supernatant after centrifugation is mixed with an equal volume of the Malachite Green/molybdate reagent containing 2 g of sodium molybdate, 0.3 g of Malachite Green and 0.5 g of Triton X-100 or Sterox SE in 1 liter of 0.7 M HCl, and the absorbance at 650 nm is then measured after a 3540 mm incubation at 25°C.
Owing to the high sensitivity and simplicity of the modified method, the slow time course of myosin ATP hydrolysis in the presence of Mg2+ and the size of initial phosphate burst can be determined accurately using relatively low concentrations of native myosin and its subfragment-1. The phosphate burst size varied with changes in pH, ionic strength, and temperature. A typical value was 0.80.9 mol per site in 0.1 M KCl, 10 mr MgCl2 pH 8.0 at 25°C for fresh enzyme preparations.
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